a{text-decoration: none;}
ul{list-style:none;}

/*
公用样式
*/
.t-red{color:red}
.b-red{background: red}
/*
布局样式
*/
/*header*/
.title{text-align: center;}
.header{width: 20rem;margin: auto;font-size: 18px;}
.header>ul{display:flex;justify-content: space-between;}


/*
footer
*/
.footer{background: black;}
.footer>ul{display: flex;justify-content: space-around}
.footer>ul>li>a{color:white;}